Bayern Munich star Renato Sanches is about to become the club's most expensive ever player, but only if he makes one more appearance for the club before the end of the season.

The Portuguese midfielder joined the Bavarian outfit last summer in a deal worth £30million but a number of lucrative clauses could eventually see the final price rocket to £67m.

With their current transfer record standing at £33m for Javi Martinez, it seems only a matter of time before Sanches takes top spot but that moment could come as soon as next weekend when Bayern Munich take on Darmstadt 98.

Renato Sanches is set to become Bayern Munich's most expensive player of all time

According to German newspaper Bild, one clause will see Benfica earn £4m if he makes 25 appearances this season. After coming off the bench against Wolfsburg, he now stands on 24.

Sanches, who may not have played as much as he expected to when making the move to the Allianz Arena, has made only five starts in the Bundesliga but has been used as a substitute a further 11 times. He has also played twice in the DFB-Pokal and made six Champions League appearances.

It means just one more game would be enough to see him overtake Martinez, who joined from Athletic Bilbao 2012.

Sanches was signed from Benfica for £30m in a deal that includes a number of huge clauses

He would also overtake Mario Gotze, who cost Bayern Munich around £32m to sign from Borussia Dortmund in 2013 and Arturo Vidal, who was signed from Juventus for the same amount two years later.

Having sealed the Bundesliga title with a 6-0 win over Wolfsburg last weekend, Carlo Ancelotti is expected to rotate his side in the upcoming fixtures against Darmstadt, RB Leipzig and Freiburg.

That essentially means Benfica can start preparing for a welcome windfall ahead of the summer transfer window.

Sanches has made 24 appearances for Bayern Munich and needs one more to activate a clause